Nailing machine



Jan. 11, 1928. 1,656,357

Y T. LUND NAILING MACHINE Filed Jan. 5, 1927 y 18 1 E a a 16 W n! v 21 JE ii .I Flg.2. 25 111.90 36 1o "a I 30 :58

Patented Jan. 17, 1928.

UNITED STATES PATENT OFFICE. 1

THOMAS LUND, OF BEVERLY, MASSACHUSETTS, ASSIGNOR TO UNITED SHOE MA- CHINERY CORPORATION, annsng.

OF PATERSON, NEW JERSEY, A CORPORATION OF NEW NAILING MACHINE.

Application filed January 5, 1927. Serial No. 159,118.

My invention relates to machines for driving nails, it being moreparticularly directed to the jack-post or work-support of that type of apparatus disclosed in Letters Patent of the United States No. 1,269,654,

fall. Since the jack-post cast with a practically unbrokeniside wall for the sake of strength, and as the plunger carrying the drivers 1s gulded by its sl ding fit- 111 a bore through the frame-bracket upon which the jack rests, these nails accumulate within the jack-body, and, gathering about the plunger, tend to wedge and thus score and rapidly wear it, so it. must'be replaced at a substantial expense. its object the provision of a structure by the use of which thisdifiiculty is avoided. This combines with the. jack-post and plunger, already outlined, a bushing furnishing a guide for the plunger and constructedand arranged to permit the discharge ot nails from the interior of the jack'post. The form of the bushing is such that it provides nail-passages, these being preferably be tween arms which radiate from an annular portion in which the pl'ul'lger. is guided. The bushing is shown as mounted by the extension of the outer extremities of its arms over the jack-post support, and the upper surfaces of these arms and the guiding annulus may be inclined so that the nails delivered to the openings between the arms will have little tendency to bridge thespaces and thus accumulate.

A particular embodiment of the invention is illustrated in the accompanyingdrawing,

Fig. 1 being a vertical section through a jack-post and a portion of the supporting trame arranged in accordance with said invention; i

Fig. 2, a broken top plan view of thejack;

This invention has for seated in a depression 36 therein.

Fig. 3, a vertical section on the line III- III of Fig. 2; while Fig. '4 shows the bushing of this invention In perspective.

At 10 appears a bracket projecting from the tront of the frame of a nailing machine such as is disclosed. in. the patent previously mentioned. In the horizontal portion of this bracket is an opening 12, through which rec procates a spindle or plunger 14 having at its upper end a head 16 carrying naildrivers 18. The drivers operate in tubes 20, which extend vertically through slots 22 in the top plate 24 of a hollow jack-post 25, the side walls of which are spaced from the plunger. This jack- 30st is bolted in place upon the upper sur ace of the bracket about the opening 12. Heads" 26 formed upon the upper extremities of the tubes rest upon the plate tosupport said tubes, which may be adjusted along their slots by a screw 28. This enables the operator to simultaneously draw the tubes in toward one another when heels are to be attached to shoes of small sizes, or move them out for the heeling of larger shoes. The drivers are correspondingly movable upon the plungerhead to permit this. At the extremes of adjustment of the driver-tubes, the openings through the jack-top may be of considerable size, amply large to allow the nails used in the heeling operation to fall through them into the interior of the j ack-body.

To guide the plunger in its reciprocation,

there is associated with the opening 1.2 a

bushing, which has amain annular portion 30, the opening of which furnishes a sliding lit for the plunger. The external, diameter of the annulus is as small. as may be, having consideration for the provision of a wall of ample thickness as a guide for the plunger, thus leaving a space between it and the wall of the opening 12 of considerable Width. Radiating from the annulus 30 are arms 32 here shown as three in number, which, at their outer extremities 34, overhang the upper face of the bracket, being The bushing may be held against upward displacement by screws 38 threaded vertically into the under sides of the arms, and with portions of their heads projecting beneath the lower wall of the bracket. Since the nails might bridge across the space between the annulus and the arms, this tendency is minimized by inclining these. The upper edge of the annulus diverges downwardly from the plunger at 40, while the upper faces of the arms bear surfaces 42 which diverge in the same direction from each other.

It will be seen that by my improved construction a guide of ample strength is turnished for the driver-plunger, and one which may readily be renewed if desired. With the plunger thus guided, nails falling into the jack-post will either be at once discharged therefrom by direct travel through the passages between the arms, or, striking upon the upper edges of either the annulus or arms, will be deflected by the inclined walls into the passages. In either case, the nails passing through the bushing will fall entirely clear of the machine.

Having described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. In a nailing machine-,a hollowjaclepost surrounding a bottom opening and having openings at its top, a reciprocatory plunger extending through the bottom opening and provided with drivers co-operating with the openings at the jack-top, and a bushing furnishing a guide for the plunger and constructed and arranged to permit the dis charge of nails from the interior of the jack-post.

2. In a nailing machine, a support provided with an opening, a hollow jack-post rising from the support about the opening and having slots at its top, nail-tubes movable in the slots, a reciprocatory plunger extending through the supportopening into the jack-post and spaced from the walls of said jack-post, drivers carried by the plunger and operating in the tube-openings, and a bushing furnishing a guide for the plunger at the support-opening and having passages arranged to permit the discharge of nails from the interior of the jack-post.

In a nailing machine, a support provided with an opening, a hollow jack-post rising from the support about the opening and having slots at its top, nail-tubes movable in the slots, at reciprocatoi-y plunger extending through the support-opening into the jack-post and spaced from the walls of said jaekpost, drivers carried by the plunger and operating in the tube-openings, and a bushing comprising an annular portion furnishing a bearing for the plunger and arms radiating from the separated points about the annulus and secured to the support, the spaces between the arms being suilicient to permit the passage of nails therethrough.

4. In a nailing machine, a supportprovided with an opening, a hollow jach-post rising from the support aboutthe opening and having slots at its top, nail-tubes movable in the slots, a reciprocatory plunger extending through the support-opening into the jack-post and spaced from the walls of said jack-post, drivers carried by the plunger and operating in the tubeopenings, a bushing comprising an annular portion furnishing a bearing for the plunger and arms radiating from the annulus and overhanging the support at their outer extremities, the upper surfaces of the annulus and arms being inclined, and securing means carried by the arms at their under sides and engaging the support.

In testimony whereof I have signed my name to this specification,

THOMAS LUND. 

